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Residential Whole Loans (Allowance for Credit Losses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Allowance for credit losses at December 31, 2019 | $ 218,011 | $ 3,025 | $ 1,651 | $ 968 | $ 3,025
Transition adjustment on adoption of ASU 2016-13 |  | 70,555 |  |  | 70,600
Current provision | (10,614) | 74,897 | 385 | 683 |
Write-offs | (627) | (647) | (50) | 0 | (1,274)
Valuation adjustment on loans held for sale | (70,181) | 70,181 |  |  |
Allowance for credit and valuation losses at March 31, 2020 | 136,589 | 218,011 | 1,986 | 1,651 | 136,589
Residential whole loans, at carrying value | 4,813,119 |  |  |  | 4,813,119
Gross up of the amortized cost basis of Purchased Credit Deteriorated Loans |  |  |  |  | 62,400
Non-QM Loans |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Allowance for credit losses at December 31, 2019 | 103,831 | 388 | 0 | 0 | 388
Transition adjustment on adoption of ASU 2016-13 |  | 6,904 |  |  |
Current provision | (2,297) | 26,358 | 0 | 0 |
Write-offs | 0 | 0 | 0 | 0 |
Valuation adjustment on loans held for sale | (70,181) | 70,181 |  |  |
Allowance for credit and valuation losses at March 31, 2020 | 31,353 | 103,831 | 0 | 0 | 31,353
Rehabilitation loans |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Allowance for credit losses at December 31, 2019 | 35,633 | 2,331 | 500 | 0 | 2,331
Transition adjustment on adoption of ASU 2016-13 |  | 517 |  |  |
Current provision | (5,213) | 33,213 | 0 | 500 |
Write-offs | (420) | (428) | (50) | 0 |
Valuation adjustment on loans held for sale | 0 | 0 |  |  |
Allowance for credit and valuation losses at March 31, 2020 | 30,000 | 35,633 | 450 | 500 | 30,000
Residential whole loans, at carrying value | 181,800 |  |  |  | 181,800
Single-family rental loans |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Allowance for credit losses at December 31, 2019 | 7,431 | 62 | 0 | 0 | 62
Transition adjustment on adoption of ASU 2016-13 |  | 754 |  |  |
Current provision | (500) | 6,615 | 0 | 0 |
Write-offs | 0 | 0 | 0 | 0 |
Valuation adjustment on loans held for sale | 0 | 0 |  |  |
Allowance for credit and valuation losses at March 31, 2020 | 6,931 | 7,431 | 0 | 0 | 6,931
Seasoned performing loans |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Allowance for credit losses at December 31, 2019 | 249 | 0 | 0 | 0 | 0
Transition adjustment on adoption of ASU 2016-13 |  | 19 |  |  |
Current provision | (25) | 230 | 0 | 0 |
Write-offs | 0 | 0 | 0 | 0 |
Valuation adjustment on loans held for sale | 0 | 0 |  |  |
Allowance for credit and valuation losses at March 31, 2020 | 224 | 249 | 0 | 0 | 224
Purchased Credit Deteriorated Loans |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Allowance for credit losses at December 31, 2019 | 70,867 | 244 | 1,151 | 968 | 244
Transition adjustment on adoption of ASU 2016-13 |  | 62,361 |  |  |
Current provision | (2,579) | 8,481 | 385 | 183 |
Write-offs | (207) | (219) | 0 | 0 |
Valuation adjustment on loans held for sale | 0 | 0 |  |  |
Allowance for credit and valuation losses at March 31, 2020 | 68,081 | $ 70,867 | $ 1,536 | $ 1,151 | 68,081
Residential whole loans, at carrying value | 100,000 |  |  |  | 100,000
Unfunded Loan Commitment |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Allowance for credit and valuation losses at March 31, 2020 | 2,100 |  |  |  | 2,100
Commitment to lend, unfunded | 94,500 |  |  |  | 94,500
Non-QM Loans |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Residential whole loans, at carrying value | $ 2,574,184 |  |  |  | $ 2,574,184

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